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Messages - Drizzt321

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886
Canon EF Zoom Lenses / Re: Canon EF 17-40mm f/4L USM
« on: January 08, 2013, 08:08:45 PM »
The site freezes up when I try to upload pictures. I used 2 jpegs, <4 MB total. Any ideas?
Thanks

Is the total size of the 2 JPGs < 4 MegaBytes (so 4,194,304 bytes)? If so, how fast is your upstream? If it's something like 512 Kbit/sec it'll take some time to upload those. You might have to wait a couple of minutes to upload.

That's right, the total size is less than 4 MB. I have a high-speed connection, so I doubt if the upload speed is the problem. Is Mozilla compatible? Do you guys use something else?
Thanks!

Just about everything should be fine, I've always used FireFox, no problems.

887
Third Party Manufacturers / Re: Sigma Launches the Sigma USB DOCK
« on: January 08, 2013, 07:19:50 PM »
^ Do you really expect corporations to code their software to work with Linux, representing a whopping under 2% of computer users? ???

Anyways, if sigma would have had this accessory years ago it would have saved their brand an awful lot of hurt over bad AF!

Well, yes. They could easily have used a cross platform library for writing the application and then it would have worked everywhere. I am tired of companies offering software for Windows and Mac OS alone. It smacks of laziness.

it smacks of good business sense, you don't waste money and stay in business.

I think what JohnnyWashngo is trying to say is, it likely could have been done in a fully cross-platform for little to no additional cost (money/personal/etc). Not sure if he's completely correct or not, but it very well may be correct since the only cross-platform stuff I've developed has been Java, and that has it's own quirks and issues.

If the cost had actually be very minimal, it might very well have been nice to release it. However, I'm sure some enterprising person will sniff the USB packets and reverse engineer the protocol. Then all of us linux geeks (well, ok, I use Windows for Lightroom. I'm sorry :( ) can put together our own application as we will.

Which Linux distribution, and what about Android for tablets?

That's the great thing of once the protocol is completely reverse engineered, it can be implemented just about anywhere on almost anything that has a USB Host. I wouldn't be surprised if Sigma releases an Android/iOS app for it either, it just makes too much sense so that you can make adjustments in the field easily if you need to.

888
Third Party Manufacturers / Re: Sigma Launches the Sigma USB DOCK
« on: January 08, 2013, 05:58:22 PM »
^ Do you really expect corporations to code their software to work with Linux, representing a whopping under 2% of computer users? ???

Anyways, if sigma would have had this accessory years ago it would have saved their brand an awful lot of hurt over bad AF!

Well, yes. They could easily have used a cross platform library for writing the application and then it would have worked everywhere. I am tired of companies offering software for Windows and Mac OS alone. It smacks of laziness.

it smacks of good business sense, you don't waste money and stay in business.

I think what JohnnyWashngo is trying to say is, it likely could have been done in a fully cross-platform for little to no additional cost (money/personal/etc). Not sure if he's completely correct or not, but it very well may be correct since the only cross-platform stuff I've developed has been Java, and that has it's own quirks and issues.

If the cost had actually be very minimal, it might very well have been nice to release it. However, I'm sure some enterprising person will sniff the USB packets and reverse engineer the protocol. Then all of us linux geeks (well, ok, I use Windows for Lightroom. I'm sorry :( ) can put together our own application as we will.

889
Canon EF Zoom Lenses / Re: Canon EF 17-40mm f/4L USM
« on: January 08, 2013, 05:18:35 PM »
The site freezes up when I try to upload pictures. I used 2 jpegs, <4 MB total. Any ideas?
Thanks

Is the total size of the 2 JPGs < 4 MegaBytes (so 4,194,304 bytes)? If so, how fast is your upstream? If it's something like 512 Kbit/sec it'll take some time to upload those. You might have to wait a couple of minutes to upload.

890
Lighting / Re: The Flash Bracket? Do they really matter anymore?
« on: January 08, 2013, 04:16:20 PM »
The trouble with the E-TTL cord is that you end up needing a third hand to hold the flash.

Do you?



That looks like a 5D3 with a st-e3-rt and two 600rt flash units.

Or you could be like this guy.


891
Third Party Manufacturers / Re: Sigma Launches the Sigma USB DOCK
« on: January 08, 2013, 03:02:26 PM »
They might. And then prevent 3rd parties like FoCal from accessing those like what they did for the 5d3. And no, I'm not going to stop grumbling about that.

Maybe it does make you feel better there's full FoCal support for the 6d again, Canon might have heard your grumbling!

Now if they fix it for the 5d3 for the supposedly forthcoming firmware update, I'll stop grumbling. If they actually do it, I'll sing a few praises, if not, I'll blast them with some more email communication asking them to stop being 'tards. In nicer words though.

892
Third Party Manufacturers / Re: Sigma Launches the Sigma USB DOCK
« on: January 08, 2013, 01:36:56 PM »
Focus setting

Contemporary, Art and Sports • Updating Lens Firmware It is possible to update the lens firmware via the internet. • Focus Setting Multiple focus setting options are available: 4 categories for fixed focal length lenses, and 16 categories (4 options for focal length) x (4 options for shooting distance) for zoom lenses.

For Sports line • AF Speed Adjustment There are 3 AF speed modes. • Focus Limiter Adjustment Offering customization for the driving range of auto focus enables a photographer to exactly reflect the personal preference. • OS Setting There are 3 OS (Optical Stabilizer) adjustment modes.

I have to say I'm impressed - lenses have reached the digital age at last, it'll be interesting to see if Canon follows and adds more customization options for their lenses directly through the eos cameras.

They might. And then prevent 3rd parties like FoCal from accessing those like what they did for the 5d3. And no, I'm not going to stop grumbling about that.

893
This lens has always been very good since its first incarnation. This model is the third, so I expect it to perform on a very high level.

Agreed, I got the original with my XSi instead of the kit lens, and always enjoyed it. Wished they had it with OS back when I got it, but if this new version is any better, it's a great value for a crop camera.

894
Canon EF Zoom Lenses / Re: Canon EF 17-40mm f/4L USM
« on: January 08, 2013, 12:26:45 PM »
I'll hop on the long-exposure band wagon :)   Here's a few from the Encinitas beach when I was there with friends for New Years on my new Benro tripod.

895
Third Party Manufacturers / Re: Sigma Launches the Sigma USB DOCK
« on: January 08, 2013, 12:21:01 PM »
I think this could be a big step in lenses, allowing end-users to be able to tweak some designs slightly. I think that if they actually made it so that this could be attached while the lens and body were attached, and something like FoCal could support the Sigma protocol, it could allow for some really interesting AF tweaks for a specific lens+body configuration. Now if only there were a way to get the lens to recognize a specific body and store camera body profiles like a body can recognize an individual lens...

896
EOS Bodies - For Stills / Re: 5d3 and FoCal errors
« on: January 08, 2013, 02:05:39 AM »
Great idea.  I have been saving the csv files along with the PDF files.  When you save a report, a menu pops up and one of the options is to save csv file.  At least there is in the Pro version.

Oh, how interesting. I never really bothered looking. Next time I do AFMA I'll have to take a look. I do have the Pro version, I figured it wasn't that much more and you never know when you might need some additional features :)

897
EOS Bodies - For Stills / Re: 5d3 and FoCal errors
« on: January 07, 2013, 07:21:25 PM »
Hey Drizzl321, if you do start to test at multiple distances, if you don't mind I would really like to see a summary of the results.  I'm trying to collect enough data to see if there are any patterns to the change in AFMA as the distance changes.  More data from different lenses and cameras would be better.

At some point I will post my results on the CR Forum.

Hmm...do you know if FoCal can export the results as a CSV? I know it does a full PDF report, but if we can get the raw data, that could start making for an interesting database of lens results.

898
EOS Bodies - For Stills / Re: 5d3 and FoCal errors
« on: January 07, 2013, 12:25:05 PM »
This thread has been stagnant for a while, but Drizzt321 asked about my test set up.  I haven’t answered because my 5D3 arrived a few days ago and I’ve been busy shooting the newness off of it.

I have to do my testing at my office after hours or during the weekend.  It’s the only place I have access to with enough space to let me test at 131 feet (40 meters).  When I start with tele-convertors or lenses longer than 200mm I will have to move to the parking garage in the basement.  Besides the available space, the office building has much more rigid floors to minimize vibration, but even so, I sit down and don't move while the tests are running.

I enlarged the standard FoCal 50FL target 2x, 3x and 4x to be appropriate with the 100FL, 150FL and 200FL test distances.  The targets are mounted on pieces of foam-core board, with the center of each target located at the same place on each board.  I made a target stand that lets me quickly change the targets without disturbing the stand or the lights.  After a target change only slight adjustments must be made to where the camera is aimed.
The camera is mounted on a tripod with the legs at their shortest length.  The tripod is anchored using a very taunt bungee cord running from the hook on the tripod to a 40 lb (18.2 kg) weight resting on the floor.

I use two 1000 watt halogen lights to illuminate the target.  These are construction lights so I have to use my Expodisc to correct white balance.  It seems to work OK.  I get between 9.0 and 10.0 EV on the target, depending on how I can arrange the lights.  The office furniture limits me sometimes.  Mostly, I can get between 9.5 and 10.0 EV.

The following is an example of the process I use:

1.   Set up target stand and lights at 16.5 feet (5 meters) from the camera.  This is approximately 200FL for 24mm, 100FL for 50mm and 50FL for 105mm.
2.   Slid 200FL target into stand and run AFMA tests, autofocus consistency test and aperture sharpness test for EF 24 F1.4L II.
3.   Mount EF 24-105 F4.0 on camera and test 24mm focal length.
4.   Change to 50FL target and test 105mm focal length.
5.   Mount Sigma 50 F1.4 on camera, change to 100FL target and run tests.
6.   At this point, if I have enough time I will change the distance and run another series of tests; or if I have another camera body available I will rerun the tests using the second body.

This may all seem like overkill, but I am interested to see if I can find any pattern to how the autofocus setting will vary with a change in distance. 

Also I wonder if some lens manufacturers are optimizing their lens designs to perform well at the standard test distances, but at the cost of performance at other distances.

Wow. Fantastic, thanks! I never would have thought of using the office before/after hours. Mine has a great looong hall, probably 100' or so, maybe longer. And printing out at additional FL test distances seems like a good idea. I'll have to get some foam board, and find a good place that can print up the targets for me.

899
Lenses / Re: Educate me about why 70mm <> 70mm...
« on: January 06, 2013, 02:06:27 AM »
[...]

Oh, and it's not "><" it's "!=".  != means not equal.

Actually it is "≠". Just in case that one cannot find it on ones keyboard, there are a few more or less common alternatives, including "<>".

See http://en.wikipedia.org/wiki/Equals_sign#Not_equal .

I was actually going to just thank the OP for using the programmer/mathematical 'not equals' the way he did :)

900
Reviews / Re: Review - Tamron SP 24-70mm f/2.8 Di VC USD with Pictures
« on: January 05, 2013, 08:02:58 PM »
Dustin, have you run this through any AF testing?  I just got mine for X-mas and was running foCal on it, getting a -5 at 24mm and +5 at 70mm  -- I've got to re-run when I have time because I stupidly forgot to shut off the VC, but I was sort of surprised that it was off in that manner.

I'm a prime-fiend, but this was supposed to win my heart back to the zoom side of things, so my hopes are high; I have gotten ZERO real world chance to use this as everyone (myself included) is sick.

Do you do MFA on any of your zooms?

I MFA'd the lens (although on MK2 I can only do focal length, which I did at at 70mm).  I ended up setting mine at a +5.  I will be picking up a MK3 in this calendar year and look forward to being able to dial it at a couple of settings.  I've been happy with the sharpness after the adjustment.
Can the MK3 do MFA by focal length/lens or do you just mean that it should be more accurate out of the box?

Thanks again.

The 5d3 can have separate MFA values for the wide end and tele end, and it can extrapolate somewhat for the middle range. Since wide vs tele can cause some focus shift sometimes, you can get more accurate focusing.

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